Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdb44c56ed28e25…

MALICIOUS

PDF

37.3 KB Created: 2020-09-06 02:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d8b07ed713d5f9d455f4e62969f9af39 SHA-1: b28b00e98d21c375fcfe29a481aaac35b12c3d88 SHA-256: 6fdb44c56ed28e25be5e60334c28528249c507f4eff9e61a2ddbc4ceeb7fbf0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm designed to distribute malicious content. The primary malicious link, 'https://ttraff.link/pify?keyword=cm+and+mm+measurement+worksheets', is identified as a redirector to known malicious infrastructure. The document's structure and content suggest an attempt to disguise malicious activity as legitimate educational material, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/pify?keyword=cm+and+mm+measurement+worksheets In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/64016906994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2161/5783/files/68322223033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kividerinogofigizunewif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/mathematics_for_economics_hoy_solutions.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d13e1f_0744e00918304d8f9ee12e89bbe12a2c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/countable_and_uncountable_worksheets_for_grade_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4578/1658/files/4480000377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8737/1167/files/60063817668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/28071788240.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2ae2582386cf4e27979301d401409196.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bf650e_ec4fa54182e54fb7a5c8d4fd2a7c0c71.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54CD 5092 bytes
SHA-256: 6bb17310d533a09113a9339ad161566b08fa6bf5cc852528cbdea08c0fb64a51
font_01_sfnt_off000065fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FC 10044 bytes
SHA-256: a45d39bdd2986f4cb69486e142f33b4b8f02cd4a1a751a275c31985578b4278c

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